Palm OS Programming, 2nd Edition

Modeless Forms

You’ll normally call FrmGotoForm to display a modeless form. It will then post:

• A frmCloseEvent for the active form (if any; as your program begins, there is no active form)

• A frmLoadEvent and a frmOpenEvent for the specified form

Your application-wide event handler, often named AppHandleEvent , handles the frmLoadEvent by calling FrmInitForm, FrmSetActiveForm, and FrmSetEventHandler to set the event handler for the form. In your form-specific event handler, you handle the frmOpenEvent by calling FrmDrawForm to draw the form.

Every modeless form in your application will require a form-specific event handler, and a case statement in your application-wide event handler, AppHandleEvent. You call FrmSetEventHandler to associate that form-specific event handler with the form. In order to display the form, you’ll call FrmGotoForm to specify that form’s form ID.